Around 9/11, for example, then-Vice President Dick Cheney said he didn't have the luxury of worrying about his health. He'd already had several heart attacks by that point.

"I didn't think about my health. I was thinking about the problem we were dealing with," he told CNN's Sanjay Gupta in an interview that aired Sunday night on CBS' "60 Minutes." It will air Tuesday on CNN's "Anderson Cooper 360."